Abstract:
The invention provides a method and apparatus for removing suspended solids from liquids. In carrying out the method, a liquid containing suspended solids is delivered to a screen with a directional component across the screen surface and a directional component through the screen. The screen has openings that are large enough to pass a majority of the suspended solids, and the screen has the ability to hold a layer of the solids on the upstream side thereof. The flow of the liquid is controlled so that the coating is formed and maintained on the screen, and serves as a filtration medium. The invention also provides improved apparatus which comprises means defining a liquid filtration zone having a screen separating it into influent and effluent zones. The screen has openings large enough to pass the majority of suspended solids and has the ability to hold a layer of the solids on the upstream side. Means are provided for delivering liquids and suspended solids to the screen with a directional component parallel to the face of the screen and a directional component through the screen.
Abstract:
THE INVENTION PROVIDES AN IMPROVED METHOD AND APPARATUS FOR TREATING WATER CONTAINING SUSPENDED SOLIDS FROM A SANITARY SYSTEM. IN CARRYING OUT THE METHOD, THE WATER IS AERATED AND DELIVERED TO A SCREEN WITH A DIRECTIONAL COMPONENT ACROSS THE SCREEN SURFACE AND A DIRECTIONAL COMPONENT THROUGH THE SCREEN. THE SCREEN HAS OPENINGS LARGE ENOUGH TO PASS THE MAJORITY OF THE SOLIDS SUSPENDED IN THE WATER, AND HAS THE ABILITY TO HOLD A COATING OF THESE SOLIDS ON ITS UPSTREAM SIDE. THE FLOW OF WATER IS CONTROLLED SO THAT A COATING OF THE SUSPENDED SOLIDS FROM THE WATER IS FORMED ON THE SCREEN SURFACE. THE DELIVERY OF WATER CONTAINING THESE SUSPENDED SOLIDS TO THE SCREEN IS CONTINUED WITH A DIRECTIONAL COMPONENT ACROSS THE SCREEN AND A DIRECTIONAL COMPONENT THROUGH THE SCREEN, WHEREBY TO FILTER SOLIDS FROM THE WATER PASSING THROUGH THE COATING AND SCREEN. THE RELATIONSHIP BETWEEN THE DIRECTIONAL COMPONENTS ACROSS AND THROUGH THE SCREEN IS CONTROLLED TO MAINTAIN THE COATING ON THE SCREEN. THE WATER THAT IS PASSED THROUGH THE SCREEN IS STORED, AND IS RECYCLED TO THE SANITARY SYSTEM.